Commodore History Series
The 8-Bit Guy has been working on a fairly comprehensive history and review of the Commodore Computer family starting from the Commodore PET, to the Commodore 64, all the way to the Commodore C128. I admit that I am complete nerd and I find this entire video series very interesting, mostly because for a brief time when I was a kid I had a Commodore 64 and it was technically the first computer that I ever owned.
In parts 4 and 5 of the series, he even has one of the engineers (Bil Herd) that actually worked on the Commodore machines give his input and insight to the design of some of the systems.
I will update this post occasionally as this particular series is a work in progress, and The 8-Bit Guy is continually adding to it.